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Little is known about the developmental trajectories of these behaviors, especially for infants born preterm. The purpose of the study was to longitudinally compare non—object-oriented exploratory behaviors performed by full-term and preterm infants. The study followed 24 full-term and 30 preterm infants 6 with significant brain injury performing non—object-oriented exploratory behaviors in prone, supine, and sitting from birth through 24 months. Infants were observed without objects or direct social interaction for 3 minutes in prone and supine 0 through 9 months and in sitting 3 through 24 months.